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Related Concept Videos

Equipments Used to Measure Body Temperature01:13

Equipments Used to Measure Body Temperature

Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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A triarylboron-based fluorescent thermometer: sensitive over a wide temperature range.

Jiao Feng1, Kaijun Tian, Dehui Hu

  • 1Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, China.

Angewandte Chemie (International Ed. in English)
|July 9, 2011
PubMed
Summary

A novel triarylboron compound exhibits stable, high-efficiency luminescence across a broad temperature range. Its color shifts from green to blue with increasing temperature due to distinct excited-state conformations.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Organic Chemistry

Background:

  • Luminescent materials are crucial for various applications, including lighting and sensors.
  • Controlling luminescence properties, such as color and efficiency, with external stimuli like temperature is highly desirable.
  • Triarylboron compounds are known for their unique electronic and photophysical properties.

Purpose of the Study:

  • To investigate the temperature-dependent luminescence properties of a specific triarylboron compound.
  • To understand the relationship between molecular conformation and luminescence color.
  • To assess the potential of this compound for temperature-sensing applications.

Main Methods:

  • Synthesis and characterization of the triarylboron compound.
  • Photoluminescence spectroscopy to measure quantum yield and emission spectra.
  • Temperature-dependent studies in a wide temperature range (-50 to +100 °C).

Main Results:

  • The triarylboron compound demonstrated a high luminescence quantum yield (≥0.64) over the tested temperature range.
  • A distinct color change from green to blue emission was observed as temperature increased.
  • The observed photophysical behavior was attributed to the population dynamics of two excited-state conformations: a local excited state at high temperatures and a twisted intramolecular charge-transfer state at low temperatures.

Conclusions:

  • The triarylboron compound exhibits robust and tunable luminescence properties.
  • The temperature-induced color shift is driven by conformational changes in the excited state.
  • This material shows promise as a sensitive and stable temperature probe.